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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::filesystem::path::iterator::iterator_category is non-comformingly "bidirectional_iterator_tag""
href="https://bugs.llvm.org/show_bug.cgi?id=38504">38504</a>
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<th>Summary</th>
<td>std::filesystem::path::iterator::iterator_category is non-comformingly "bidirectional_iterator_tag"
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>Casey@Carter.net
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
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<pre>std::filesystem::path::iterator's member iterator_category is an alias for
bidirectional_iterator_tag, despite that it does not satisfy the requirement in
[forward.iterators]/6:
If a and b are both dereferenceable, then a == b if and only if *a and *b
are bound to the same object.
An iterator cannot be bidirectional if it is not forward, so the
iterator_category should in fact be input_iterator_tag, or - as a conforming
extension - some other type which is convertible to input_iterator_tag but not
convertible to forward_iterator_tag.
Note that if path::iterator::operator* were to return a prvalue it would
conform to the BidirectionalIterator concept in the Ranges proposal, and could
conformingly define its member iterator_concept as an alias for
std::bidirectional_iterator_tag.</pre>
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